Shadow Treasurer Chris Bowen called Mr Morrison "immature" and "cranky" and said "the price has been paid by regional and rural Australia."

However, the revised bill looks set to pass the Senate with the support of key crossbenchers including Derryn Hinch and those from the Nick Xenophon Team.

Senator Xenophon described the result as a "win-win" because the Government had backed his plan to allow Australian seasonal workers on Youth Allowance or New Start to earn up to $5,000 without a penalty.

"It is a big breakthrough and removes the disincentive for people on unemployment benefits to do that seasonal work where there are genuine labour shortages," he said.

The backpacker tax debate has dragged on for 18 months and reached a tipping point over the weekend when Nationals MP Andrew Broad broke ranks and called for a 15 per cent rate.

The move infuriated many within the National party, who were confident that Labor would eventually agree to 19 per cent.

Assistant Minister to the Deputy Prime Minister Luke Hartsuyker, who has played a key role in backpacker tax negotiations, this morning told reporters that Mr Broad "for a very long time" advocated a 19 per cent tax rate.

He also reiterated his personal support for that figure.

Greens want backpacker superannuation rule scrapped

The backpacker tax compromise package also includes higher taxes on working holiday makers' superannuation.

The Greens are concerned about the change, which mandates that backpackers can only claim 5 per cent of their superannuation when they leave Australia.

That proposal has already passed the Parliament but the Greens will attempt to reverse the change.

Tasmanian Greens Senator Peter Whish-Wilson said the effective tax rate for backpackers will end up being higher than 15 per cent, due to the superannuation requirements.

"This is effectively [a] 24 per cent [income tax]," he said.

"We have to be really careful. The super stuff has not made the headlines. It has been the fine detail that everybody has missed."

Senator Whish-Wilson said he did not think working holiday makers would bother claiming such a small amount of superannuation.

The Commonwealth may not be able to access the other 95 per cent as revenue unless the backpacker files a claim, Senator Whish-Wilson said.

Farmers welcome 15pc backpacker tax compromise

National Farmers' Federation workplace relations general manager Sarah McKinnon threw her support behind the new rate and described it as "fair".

But she pointed out that a consensus could have been reached months ago, when the Government first announced its compromise rate.

"There is no question that no party has covered itself in glory on this issue," she said.

"It has been a disappointment. Farmers are let down by the political process that has seen games come ahead of the public interest."